I first experienced this issue in the last build before this one. When I would add pretty much any video to a play list there is now a bug in Shotcut where the video in the playlist is either shorter or longer than the actual video. I thought it might've been obvious enough to correct in the most recent build but I see that it hasn't so I want to call attention to it now.
This is difficult to spot because it seemingly happens at random and with any video. Sometimes I have had to remove the video and try to add it in the playlist a number of times before it had the correct duration because the video was shorter than it was originally. Sometimes it goes fine at the first try. And sometimes I have to edit more from the timeline during my workflow in order to remove the extra time added.
I hope this gets acknowledged and solved.